Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)
MA 40.86: Poster
Freitag, 27. März 2009, 11:00–14:00, P1A
Time resolved field induced domain wall excitations in permalloy wires — •Jan Rhensius1,2, Lutz Heyne2, Dirk Backes1,2, Stephen Krzyk2, Dennis Ilgaz2, Mathias Kläui2, Laura J. Heyderman1, Ulrich Rüdiger2, Frithjof Nolting1, and Arantxa Fraile-Rodriguez1 — 1Paul Scherrer Institut, 5232 Villigen, Switzerland — 2Universität Konstanz, 78457, Germany
Micromagnetic systems are predicted to be useful for future magnetic storage devices. Therefore the investigation of the fundamental mechanisms of magnetization dynamics is essential. Field induced domain wall excitations are investigated with time and spatially resolved XMCD-PEEM (X-ray Magnetic Circular Dichroism - Photoemmission Electron Microscopy). We study the domain configurations in permalloy wires with a width of 2 μm, fabricated by electron beam lithography. Using a 10 *m wide stripline, connected to a laser triggered diode, well defined sub-ns field pulses were applied to move the domain wall. By triggering the channel plate of the PEEM at a well defined delay time, this pump-probe experiment achieves a time resolution of below 100 ps and a spatial magnetic resolution of about 50 nm. With this we can quantitatively analyze the response of the domain wall to the field pulse and we find domain wall displacements with velocities of hundreds of m/s. To understand the results, we compare the experimental data with results of micromagnetic simulations and find good agreement.